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The relation between the normal force (n) acts on mass m and the kinetic friction force (f) between m and the air track surface

The relation between the normal force (n) acts on mass m and the kinetic friction force (f) between m and the air track surface is shown beside, calculate the kinetic friction coefficient (14)? m 5m M 1.5m n(N) 20 16 12 08 04

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